The letters on the silk screen for the control bank don’t match the labels on the schematic. Maybe they’re following a convention that I don’t know but in any event the only pins I feel confidant in are the led pins and the four that are actually numbered, the rest are up in the air. It would be a lot easier for me if they were just numbered, so if anyone could tell me what pin goes with what label it would be a big help.
Hello,
The lettering on the silkscreen is just abridged to 2 letters because of space.
For exemple :
VS = VBSEL
AG = AGND
etc.
All the pins on the C bank have dedicated usage. the L are obviously bound to the LEDs.
The 4 numbered pins these can be used to program the FPGA and depends on which mainboard you are using :
For Cu, these are used for SPI.
For Au and Pt, these are JTAG.
The non-numbered pins on the schematic are either VCC, 3.3v or GND, there are many pins bundled together to handle more current.
The full pinout along with numberings are shown here : Pinouts and Custom Elements
I guess part of my confusion came from just looking at the Cu pin table since that doesn’t use many of the pins, but even looking at the other pinout tables there are pads that are ambiguous. Is V+ supply voltage or regulated 3.3 Volts? That’s the only pad that looks to me like a voltage so is the other one just not broken out? R and RS both make sense as resets, which one is Reset and which one is c_reset? Except c_reset on the Cu shares pin 41 with Program on the Au which I’m assuming is PR so PR is probably for c_reset but I’m not sure which one of R and RS means something else.
V+ is regulated 3.3v
R stands for RAW and is raw (unregulated) supply voltage (5v from USB or the voltage supplied through + and - pads on main board)
RS is the reset button that you can handle as you like in your design
PR is used to put the FPGA in configuration / program mode (on the Cu, c_reset means configuration reset), on the Cu it’s kinda like an hard reset.
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